Bmed @ Cwl
LHR - CWL (Night Stop) - LHR
This is due to having to keep the slot at LHR until it's new route is confirmed.
The reason it has not been operating since the new year, is that offices (im not sure if it was ATC in london) were being moved and no unecessary traffic were to move. This came from BMED ops but i doubt it would take a month to move offices.
According to the flightdeck, Virgin do similar things but they fly a light a/c instead of one of their fleet as it is cheaper on running costs.